Enterprise Trunking
Meet changing communication needs with a scalable voice solution
Features resources
PRODUCT BRIEF
Enterprise Trunking
TECH SPECS
SIP Trunking Technical Specifications
TECH SPECS
PRI Technical Specifications
Reliable voice trunking that meets new business demands
Be prepared for changing communication needs with our Enterprise Trunking service that scales as your business requirements and infrastructure evolve. Choose from high-capacity SIP, PRI and voice services — all delivered with 99.99 percent availability over our nationwide fiber network.

Rely on a dedicated partner
We’re able to meet your ever-changing requirements by supporting your preferred trunk interface and handling either centralized or decentralized configurations. Also, our flexible service lets you scale as needed by adding more capacity, Minutes of Use (MOU) or other advanced features.
Choose what works for you
Enterprise Trunking is delivered over our private fiber network. We proactively monitor our network 24/7/365, giving you confidence that your dedicated connection is available and performing at the highest level.
Do business with ease
One monthly transaction delivers everything you need — the connection, DID numbers, long distance plans and network interface.
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Session Initiation Protocol (SIP)
Primary Rate Interface (PRI)
Toll-free service
Business continuity
Load balancing
Minutes of Use (MOU) sharing
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SIP trunking is designed to provide voice service that’s cost-effective, flexible and reliable. From the public phone network to the handoff at your PBX, we manage every aspect of performance.
To provide assurance of interoperability, Spectrum Enterprise SIP trunks earn SIPconnect™ certification and are tested and pre-approved with leading IP PBX manufacturers, including Avaya, Cisco and Mitel.
Spectrum Enterprise SIP Trunks can support Microsoft Teams Direct Routing. Organizations using Microsoft Teams for business calling can connect to the public phone network via SIP Trunk and a Microsoft-certified Session Border Controller (SBC).
PRI trunks provide a cost-effective and reliable voice service for your ISDN PRI enabled PBX equipment. From the public phone network to the handoff at your PBX, we manage every aspect of performance.
Our toll-free service extends your organization’s reach and keeps things simple. You pay just one flat rate for calls from the 50 U.S. states, U.S. territories and Canada.
Highlights include:
- Keep your existing toll-free number, or select a new one at no additional charge
- Customize routing options based on call origination, date and time received, or percentage to different destinations
- Accept or block incoming toll-free calls from specific area codes or exchanges
Our business continuity options are designed to keep your organization running smoothly, even during peak calling periods and extra-heavy calling days. The options range from having the service automatically reroute inbound calls to full-path diversity.
Highlights include:
- Automatic rerouting of inbound calls to any destination when all channels (or call paths) in the trunk group are in use
- A primary and secondary fiber connection between your organization and our network with no single point of failure
- Redundant voice gateway equipment
Our load balancing options enable you to balance your trunking resources more efficiently by distributing incoming voice traffic across multiple trunks. We also offer a variety of routing options — including circular, weighted percentage, most idle and least idle — to give you the flexibility to best manage traffic according to your specific needs.
Highlights include:
- Manage peak usage across different locations and time zones
- Gain more granular control over network utilization by load balancing your trunks
- Route calls to available trunks if a trunk becomes unavailable
Finding ways to manage costs is key to a successful business. Minutes of Use (MOU) sharing helps you control your long distance costs by giving you a single enterprise-wide plan for all of your trunks. Easily see usage across the organization from our web portal.
Highlights include:
- Control long distance, international and toll-free calling charges with a single, predictable monthly plan
- Optimize your long distance calling costs by “pooling” or sharing minutes across trunks
- Get lower effective rates with larger plans spread across multiple trunks
Built for your needs
Connectivity options
Connect via SIP, PRI or analog lines.
Service-level agreement (SLA)
Our exceptional SLA provides 99.99% service availability from the public phone network all the way to the handoff at your PBX.
Calling packages
Our MOU packages include outbound long-distance, international outbound calling to more than 50 countries and inbound toll-free, as well as unlimited local calling.
Calling rates
See our domestic and international long-distance calling rates, and directory assistance and operator service options.
Scalability
Scale from as few as eight call paths to thousands with no data circuit, installation or equipment fees.
Secure private network
Trunks are delivered to the public phone network through our private fiber network, keeping voice traffic away from the internet and ensuring you have reliable and secure voice service.
Dedicated bandwidth
Voice traffic remains separate from data traffic and receives its own bandwidth allocation, so your voice and data services never compete for capacity.
Analog options
You have the ability to connect older analog devices, such as fax machines, point-of-sale devices and key systems/PBXs.
E911 service with PS/ALI option
You can pinpoint emergency 911 calling locations to a floor, suite or room number.
Full-service local provider
Get a full range of calling services including local calling, domestic and international long distance, inbound toll free, directory listing, directory assistance and operator services.
Portal
Get anytime, anywhere online access to costs, usage and business continuity options.
Additional services to consider
We’re here to meet your evolving needs. As a single-source provider, we bring services together to create an experience that’s reliable, scalable and efficient. You might also consider:
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